Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250S is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm bore, 250mm stroke and a built-in spring-applied, air-released mechanical lock in the front cover — it holds the load at the extended (rod-out) stroke end even when air is lost.
- BoreØ80 mm
- Stroke250 mm
- Port sizeG3/8
- Lock positionFront cover
- Rod threadM20×1.5
- UnlockAir + manual
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250S
The AirTAC SAILF80X250-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. Because the lock sits forward, it engages when the piston reaches the extended stroke end, securely holding the rod-out position without requiring continuous live air pressure. In this bore size, the cylinder generates 2513N of push force and 2268N of pull force at 0.5 MPa, utilizing a 25mm carbon steel rod and 3/8 PT porting.
This model includes a magnet (-S) for position sensing with AirTAC CMSE reed and DMSE electronic switches. The variable air cushion at the locker end is physically shorter (22.5mm) than the free-end cushion (36mm) to accommodate the locking mechanism. Remember that this cushion only decelerates the moving load near stroke termination; the mechanical lock is the true static holding device once the cylinder stops.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 250 mm |
| Acting type | Double acting, with lock |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| Lock type | Spring-applied, air-released (front cover) |
|---|---|
| Unlock | Automatic (air) & manual |
| Operating pressure | 0.15 – 1.0 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable (36 mm free end / 22.5 mm lock end) |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAIL datasheet (ISO 15552). Confirm against the product label before installation. Port options: PT / G.
How the Lock Holds
The lock is spring-applied and air-released: a spring drives a lock pin into the rod when the release air is removed, so the load is held at the extended (rod-out) stroke end without live pressure. Supply air to the release port to unlock automatically, or use the manual release lever.
The lock engages only when the piston reaches the stroke terminal on the front-cover side — it is a static end-of-stroke hold, not a mid-stroke clamp and not a moving-rod brake. For locking at any position along the stroke, choose a BSAI clamp-lock instead.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
Cylinder thrust is separate from the lock's holding capability. Actual usable force is lower than theoretical due to friction and back-pressure — size with a margin.
Where the Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250S Is Used
Extended Lift Holding
Maintains a lifted load in the extended rod-out position during a power loss, using the spring-applied lock to prevent sudden drops without needing live air.
Safety Gate Locking
Secures a heavy safety gate in the fully open position. The air-released lock keeps the barrier safely extended until the control system actively supplies unlock pressure.
End-of-Stroke Clamping
Holds a workpiece firmly at the maximum extended stroke end. The static lock sustains the clamping force, while the shorter 22.5mm front cushion manages the final deceleration.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250S the Right Lock Cylinder?
Choose this 80mm bore if your application requires 2513N push force at 0.5 MPa; step down to a 63mm bore (1559N push) for lighter loads, or up to a 100mm bore (3927N push) for heavier demands. Select the SAILF configuration when the load must be held safely at the extended rod-out position, and choose SAILB instead if holding at the retracted position is required. If your process demands clamping at an arbitrary mid-stroke point rather than at the stroke end, the AirTAC BSAI clamp-lock cylinder is the correct choice.
The lock is a static holding brake that engages after the rod stops, not a dynamic braking system for moving loads. Valve selection is critical: never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can unintentionally release the lock—always use an independent-exhaust solenoid valve. For safety-critical lifting applications, add an independent mechanical safety measure. At 250mm stroke, ensure adequate external guidance to prevent side-loading on the 25mm carbon steel rod. Replacement matches must specify 80mm bore, 250mm stroke, front locker, PT port, and the -S magnet.
Quick checklist
- ✓ Hold needed at the extended (rod-out) end?
- ✓ Or lock anywhere → use BSAI
- ✓ Independent-exhaust valve fitted
- ✓ Port/thread type (PT/G)
- ✓ Extra safety measure for people
Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250S FAQ
At 0.5 MPa operating pressure, this 80mm bore cylinder generates 2513N of push force and 2268N of pull force. At 0.7 MPa, the push force increases to 3518N.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end in the front cover. It provides a static hold after the rod stops, not a dynamic brake. You can unlock it automatically via air pressure to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.